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LC201S Datasheet(PDF) 8 Page - Sanken electric

Part # LC201S
Description  Power Supply IC for Microcomputer
Download  13 Pages
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Manufacturer  SANKEN [Sanken electric]
Direct Link  http://www.sanken-ele.co.jp/en
Logo SANKEN - Sanken electric

LC201S Datasheet(HTML) 8 Page - Sanken electric

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LC201S
LC201S-DS Rev.1.2
SANKEN ELECTRIC CO.,LTD.
8
Mar. 30, 2016
Figure 8-3 The reference startup time of OUT2 pin
After startup, there is two way of suppplying power to
IC.
In case the power of IC continues to be supplied via
ST pin , OUT1 pin voltage becomes VOUT1 (9V or 20V
refer to Table 8-1).
In case the power of IC is supplied from external
power supply, OUT1 pin is connected to the auxiliary
winding of external power supply. Since the power
supply pin can be switched from ST pin to OUT1 pin,
the power dissipation of the startup circuit can be
eliminated after startup process.
VAC
C1
D2
C2
D
P
BR1
OUT1
GND
ST
8
1
5
U1
VD
External
power supply
Figure 8-4 In case the power of IC is supplied from
external power supply
After external power supply starts, when the auxiliary
winding voltage, VD, is lower than VOUT1, OUT1 pin
voltage keeps VOUT1.
When VD increases and OUT1 pin voltage becomes
higher than VOUT1, the startup circuit of IC is cut
automatically. Then OUT1 pin voltage becomes the
rectified and smoothed VD voltage.
The number of turns of auxiliary winding D is set
such that OUT1 pin voltage, VOUT1(D), becomes within
the range of Expression (1) in the specification of the
input voltage range and output load range of the power
supply.
V
35
V
V
OUT1(D)
UVH
(1)
Where, VUVH is UVLO Operation Stop Voltage. VUVH
depends on the setting of SL pin (refer to Table 8-2).
The diode D2 should be a fast recovery diode since a
high frequency switching current flows to D2.
8.3 Current Sink Function
When the output voltage of OUT2 pin is OFF, the
Current Sink Function prevents the output voltage of
OUT2 pin from varying by external factor.
When this function is used, SINK pin is connected to
OUT2 pin as shown in Figure 8-5.
GND
1
U1
UVLO
Linier
Regulator
5
OUT2
OUT1
4
SINK
R1
ISINK
3
QSI
Figure 8-5 SINK pin peripheral circuit
Figure
8-6
shows
Current
Sink
Function
operational waveforms.
When
OUT1
pin
voltage
decreases
UVLO
Operation Stop Voltage, VUVL, the output of OUT2
pin becomes Low state. At the same time, QSI turns on
and the sink current flows into SINK pin. Thus the
output of OUT2 pin is fixed Low state immediately.
When OUT1 pin voltage increases to UVLO
Operation Start Voltage, VUVH, or more, QSI turns off
and OUT2 pin outputs VOUT2 = 5 V.
The value of R1 connected between SINK pin and
OUT2 pin should be selected considering the range of
the absolute maximum ratings of SINK pin current.
OUT1 pin voltage
ST pin current
VUVH
VUVL
ISINK
OUT2 pin voltage
5V
Figure 8-6 Current Sink Function operational
waveforms.
0.001
0.01
0.1
1
1
10
100
Capacitance of C2 (μF)
SL=Open
SL=0V


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